BébéSounds® Angelcare® Movement and Sound Monitor™ system     Our Movement Sensor with Sound Monitor detects your baby's slightest movements, even while she sleeps. While it may seem that your baby is perfectly still when she is sleeping, she really isn't. An alarm will sound alerting you to check your baby only if she becomes absolutely still for 20 seconds and no movement whatsoever is detected.     Stop worrying while your baby sleeps!™ 2 monitors in 1 - 200 foot range If absolutely no movement is detected for 20 seconds an alarm will sound. Whether your baby is awake or asleep, the under-the-mattress sensor pad detects all your baby's movements - even the slightest ones. The BebeSounds® Angelcare® Movement and Sound Monitor™ system includes: 1 Under-the-mattress sensor pad- works with any size crib mattress. 1 Nursery Unit Movement indicator Dual channels Low battery indicator Alarm indicator Automatically converts to battery in case of power failure Optional "Tic" feature transmits sounds every time baby moves 1 Parent's Unit Movement indicator Dual channels Low battery indicator Alarm indicator Automatically converts to battery in case of power failure Sound indicator - see and hear your baby's sounds Adaptors included - Batteries optional Requires 8 AAA batteries (not included) The BébéSounds® Movement Sensor will give you the peace of mind you won't get from just a sound monitor or even a video monitor. And, this monitor is an excellent value. It is 2 monitors in 1 so you don't have to purchase a sound monitor. One year warranty!